Grinding machinery



Ot. 23, 1934. B A KEARNS 1,978,110

GRINDING MACHINERY 8% l dumm Oct. 23, 1934. B. A'. KEARNS 1,978,110 4GRINDING MACHINERY l -Filed Feb. 13. 1930 3 Sheets-5heet 2 OcL23, 1934.B, A KEARNS" 1,978,110

l GR-INDING MACHINERY Filed Feb. 15.' 1930 3 Sheets-Sheet 3 f ff,

Patented Oei. z3, i934 L m Y UNITED STATES PATENT GRINDING MACHINERYBernard A. Kearns, Cincinnati, Ohio, assignor -to Cincinnati GrindersIncorporated, Cincinnati, Ohio, a corporation of Ohio ApplicationFebruary 13, 1930, Serial No. 428,169

` 14 Claims. (Cl. 51-165) This invention relates to improvements inmachine tools and 'especially to improvements in grinding machines ofthe center type.

One of the objects of the invention is the pro- 5, vision of improvedmeans for effecting a rapid cross feed movement of a translatable partof a' machine tool organization.

Another object of the invention is the provision of improved means forfacilitating the cross feed movement of a grindingwheel carriage forexample thereby reducing-thel time for shifting thesaid carriage to aminimum and increasing the production of the machine. l

Other objects and advantages of the present construction should bereadily apparent by reference to the following specification consideredin conjunction with the accompanying drawings forming a part thereof andit is to be understood that any modifications may be. made in 20 theexact structural details without departing from or exceeding the spiritof the invention.

` Figure 1 is a transverse sectional view of a grinding machineembodying the improvements of this invention. Y

Figure 2 is a sectional view taken on line` 2 of Figure 1.

Figure 3 is a sectional view of Figure 1.

Figure 4 is a sectional view taken on line 4-4 of Figure 1. f f

Figure 5 is an enlarged sectional view of certain parts shown in Figure1 and as seen from line 5-5 of Figure 4. f

Figure 6 is a sectional view taken on lline 6-6 of Figure 1, and

Figure 'i is a semi-diagrammatic view of .a modification embodying theinvention.

Throughout the severalviews ofthe drawings similar reference charactersare employed to denote the same or similar parts.

A device embodying this invention may comprise a bed 10 having formedthereon ways 11 and 12 guiding for longitudinal translation thereofa'work supporting tab1e13. Ways 14 may also be provided extendingtransversely of the taken on s-s bed10 for supporting and guiding agrinding wheel carriage 15 .having journaled asat 16 a spindle 17supporting for suitable rotation grind- 4 ing wheel 18. Any desiredmeans may be employedfor translatingthe work supporting table 13 as wellas the grinding wheel carriage 15 which as shown herein utilizes thefollowing mechanism. A web 19 depends interiorly of the carriage 15, andhas iixedly secured therein a `nut 20 threadedly receiving one end offeed screw 21.

A those conversant with this art.

Feed screw 21 is mounted in anti-friction bearings 22 carried by thehousing 23 secured to the rear of the bed or support 10. Feed screw 21is restrained from axial movement and has secured to its rearmost end awide faced gear 24 60- in mesh with pinion 25 of compound gear 26. Thisgear 26 is slidably supported for rotation on a shaft 27 and has a largegear 28 meshing with pinion 29 on countershaft 30. Compound gear 26 isprovided with an annular groove 28a 65- receiving the end of shifterfork 29a pivoted at 30h to the housing 23. The other end 31 of shifterfork 29a is pivotally secured to link 32 secured at its inner end toslide block 33 fast on shifter` shaft 34. The shaft 34 'is adapted to'I0-` be axially shifted through its bearings 34a in the walls of bed 10by means to be later described and in so doingit shifts the compoundgear 26' to the left as seen in Figure 1 to mesh the teeth of gear 28with pinion 35 on the end of shaft 36 I5 iournaled in bearings carriedby the bed 10. Shaft 36 has secured to itsforward end a gear 37 forminga part of they normal standard feed mechanism indicated generally bythenumeral. 38 or a part of the hand feed mechanism-and ter- 80 minatinglin the hand lever 39. Included Vwith the feed mechanism 38 is theratchet member 40 cooperating with the automatic feed pawl of thefeeding 4mechanism as will be understood by From the foregoingdescription it will be understcod that if compound gear 26 is shifted toengage gear 28 thereof, with the pinion 35, the grinding wheel carriage15 may be actuated toward or from the work supporting table 13 throughthe standard feed mechanism 38 or manually by means of the hand lever39. To rapidly actuate the grinding wheel and its carriage from andtoward the work supporting table when it is desired for example, toremove finished work piece therefrom and place an unfinished work piecethereon or when it is desired to position 'the wheel to true the surfacethereof the following mechanism may be employed. Countershaft 30 isslidably mounted in bearings 30a and has secured to its inner end clutchmember 41 provided with clutch teeth 42 adapted to engage clutch teeth43 formed on the-end of sprocket 44 loosely journaled on bearings 45surrounding the countershaft 30. The hub 46 of pinion 44 is journaled ina depending portion .or bracket of the housing 23 and is restranedfromaxial move' ment while permitted unrestrained rotativeA movement. Inorder to shift clutch 41 to disengage the clutch teeth 42 and 43, theshaft 30 has ,no

.forwardly of the pivot member secured thereto and anking the drivepinion 29 a pair of collars 47 and 48. These collars 47 and 48 engageopposite sides of the gear 28 so that as the compound gear 26 is shiftedto engage the teeth of the gear 28 with the teeth of the pinion orvice-versa the said gear 28 acts through the collars 47 and 48 to'shiftcountershaft 30 to disengage or engage the clutch teeth 42 and 43.

To insure proper engagement of the clutch teeth 42 and 43 and properpositioning of the parts the clutch member 41 is substantially tubularin construction and has interiorly thereof a spring 100 surrounding theshaft 30 abutting on one end a collar 101 secured to the shaft and onthe other end a shoulder 102 formed on the clutch member 41. By thisconstruction should the clutch 42 and 43 not be in condition to properlyengage one another but be positioned one on top of the other continuedmovement of the shaft 30 would compress the spring 100 and as soon asmovement is imparted to the parts by means to be described later thespring will expand and properly engage the teeth 42 and 43. The drivingsprocket 44 has trained thereover silent chain likewise engaging drivingpinion 51 secured to the shaft 52 of prime mover or motor 53. From theforegoing description it will be seen how the feed screw 21 is rotatedfor rapidly power actuating the grinding wheel carriage 15 toward- .andfrom the work supporting table.

The motor 53 is of the reversible type and to control its rotation anddetermine whether the manual, normal feed mechanism or power rapidtraverse mechanism is connected with the carriage 15 the followingmechanism is employed. The shift rod 34 has secured to its forward end54 a shifter head 55 slidably actuated through housing 56 carried by theforward face of bed 10. The head is provided with a cam groove 57 inwhich a roller 58 is adapted to be moved which roller 58 is carried by astud 49 secured to and movable with cross head 59. An actuating -memberhaving a ball end 61 received in a socket 62 formed in the cross head 59is providedfor actuating the said cross head 59 and effecting theshifting of shift rod 34.

Actuator 60 is carried bya pivot member 63 pivotally mounted on a stubshaft 64 joumaled in the side walls of housing 65. A pin 66 extends 63and pivotally supports a control handle or lever 67 having a stub 68surrounding the said pivot pin 66. A lug or ear 69 extends from thehandle 67 intermediate the ends thereof cooperating with a notch 70formed in switch actuating bar 71. Switch bar 71 is guided in suitableguide ways 72 and 73 formed in the upper surface of housing 65 having anadjustable connection at 74 with finger 75 pivoted at 76 to link 77.Link 77 is in turn pivoted at 78 .to a bracket 79 extending interiorlyof the bed 10 and has a sliding connection at 80 with switch arm 81 ofdrum switch 82. This drum switch 82 is electrically connected with thevmotor 53 for reversely rotating same to effect reverse movement of thegrinding wheel carriage as above described. y

In order to prevent the power drive being connected when either themanual means or normal feed means is employed the switch bar 71 isprovided with an upstanding lug 84 cooperating with a slot 85 formed inthe underside of cross head 59 to interlock therewith.

The operation of the control mechanism controlled by shift lever 67 isas follows:

Assuming that a work piece has been completed and it is desired toremove same from the work supporting table and replace a new work piecethereon handle or lever 67 is actuated in a counterclockwise directionabout the pivot stub shaft v to the position shown for example inFigures 2 and 3. This movement will similarly actuate arm 60 to shiftthe cross head 59 to the rear. to the position shown in Figure 2. In sodoing roller 58 carried by the cross head 59 will through the cam groove57 shift the head 55 on the end of shift rod 34 forwardly carrying withit the said rod 34, slide block 33 and link 32 actuating the shifterfork 29a about its pivot to rearwardly shift compound gear 26 andthrough the interengagement thereof with collar 47 correspondingly shiftshaft 30 to engage the clutch teeth 42 and 43 thereby connecting thecross feed screw 21 with the motor 53. Handle or lever 67 now has thelug 69 thereof within the notch 70 in switch barl 71 whereupon it isshifted either to the right or left as seen in Figure 3 tocorrespondingly rotate the switch arm 81 and effect a rotation of motor53 either in a clockwise or counterclockwise direction. As here shown,the shifting of the lever or handle 67 to the right or toward the bed100 10 actuates the motor in a directionto retract the grinding wheelcarriage from the table 13. After the work piece has been properlypositioned on the work supporting table the handle or lever 67 isactuated in the reverse direction or away from the bed 10 as seen inFigure 3 to effect a rotation of the motor 53 for actuating the grindingwheel carriage toward the work supporting table. As soon as the grindingwheel has approached the work the proper amount handle 67 is actuated toits neutral position thereby stopping further actuation of the motor andconsequently the grinding wheel carriage. Handle 67 is again actuatedabout the stub shaft pivot 64 in a reverse direction or in a clockwise59 to the right asseen in Figure 2 and actuate slide bar 34 to the rearto disconnect the gear 28 from pinion 29 of the power transmission andconnect same with pinion 35 of the normal feeding mechanism 38 thegroove 85 arides over the upstanding lug 84 on the switch bar 71 lockingthe switch bar in this position so that the switch 82 cannot beoperated.

direction to shift cross head or hand lever 39. At this time 'I'hemodification shown in Figure 7 includes a 125 shaft 86 having on the endthereof a pinion 87 similarto pinion 29 on shaft 30 adapted to be-meshed with the gear 28. This shaft 86 has on its forward end a pair ofbevel gears 88`and 89 formed integral with a sleeve 90 slidably keyedthereto. A hub 91 extending from the gear 89 is provided with a shiftmechanism including arm 92 pivotally connected with link 93 having' oneend secured to rock shaft 94 joumaled in bearing 95 and having a lever96 on the end thereof. The lever 96 is employed for shifting the sleeve90 to cause engagement of the teeth of either of gears 88 or 89 withdrive pinion'97-to effect a reverse I rotation of drive shaft 86. Pinion97 is carried by a shaft 98 joumaled in bearing 99 carried by the innersurface of the bed 10 andcoupled with unidirectional motor 100. Fromthis it will be seen that shaft 96 may be rotated in either a clockwiseor counterclockwise direction from the motor 100 depending on theposition of handle 96. The construction here employed is such that iflever 96 were actuated away from the bed 10 the grinding wheel carriagewould move toward the work supporting table and if reversely actuatedthe carriage would be retracted from the table or, in

other words, lever 96 similar to lever 67 indicates .the direction ofmovement of the carriage 15 and may be known as a direction indicatinglever.

What is claimed is: 1. In a grinding machine of the class described thecombination of a bed, a work supporting table mounted thereon fortranslation longitudinally thereof, a grinding wheel carriage mounted onthe bed for movement transversely thereof tolO ward and from the worktable, manual means for effecting the movement of the carriage at afeeding rate, reversible power actuated means for effecting a movementof the carriage at a rapid rate, and a single means for connectingeither the manual means or the power means with the carriage and foreffecting the energization of the latter means whereby the carriage maybe actuated in either direction by either the manual or the power means.

2. In a machine tool organization the combination of a bed or support, awork supporting table movable longitudinally thereof, a tool supportingtable movable transversely of the support toward and from the worksupport, manual means for effecting the shifting of the tool support ata feeding rate, power actuated means for effecting the shifting of thetool support at a rapid rate and means for connecting either the manualmeans or the power means with the tool support, and interlocking meansto prevent actuation of the tool' support by either the power means orthe manual means when the other is being employed. v Y

3. In a grinding machine the combination of a bed or support, a toolcarriage carried thereby and movable relatively thereto, means foractuating the tool carriage at a slow feeding rate, means for actuatingthe tool c-arfV riage at a rapid rate including a motor, a trans- 40mission line operatively connecting the motor with the tool carriage, aswitch for the motor and means associated with the switch to determinethe direction of rotation of the motor and the direction of movement ofthe tool carriage. 4. In a grinding machine of the class described thecombination of a bed, a grinding wheel carriage carried thereby formovement relative thereto, a screw for moving the carriage in reversedirections relativeto the bed, a gear fixed on the screw, a shiftabletransmission gear in mesh with the screw gear, means for rotating thetransmission gear at a slow rate, a reversible independent source ofpower for rotating the transmission gear at a rapid rate, means forconnecting the transmission gear with either the slow rate rotationmeans or the independent source of power, and simultaneouslydisconnecting it from the other, and for determining and indicating thedirection of actuation of the independent source of power andconsequently the direction of actuation of the carriage.

5. In a grinding machine the combination of a bed or support, a toolcarriage carried thereby,

a screw for moving the carriage in reverse directions relative to thebed, a shiftable idler gear in mesh with the screw gear to rotate same,means for rotating the idler gear at a slow rate, a reverisibleindependent source of power for rotating the idler gear at a rapid rate,means connectmg the idler gear with either the slow rate rotation meansor the independent source of power, and

for determining the direction of actuation of the independent source ofpower said means including a single manually actuable member.

6. In a grinding machine the combination of a bed or support', a toolcarriage carried thereby and movable relativethereto, means foractuating the tool carriage at a slow feeding rate, means for actuatingthe tool carriage at a rapid rate including a reversible motor, andmeans for connecting either the slow feeding rate means or the rapidrate means with the tool carriage and for determining the direction ofrotation of the motor including a shifter rod, a switch and a manuallyshiftable lever for actuating the shifter rod and switch.

7. In a grinding machine the combination of a bed or support, a toolcarriage carried thereby and movable relative thereto, means foractuating the tool carriage at a slow. feeding rate means vfor actuatingthe tool carriage at a rapid rate including a motor and control meanscommon to the carriage shifting means operable through Y one plane forconnecting either the slow feeding rate means or the rapid rate meanswith the tool carriage and operable through an angularly related planeto effect rotation of the motor.

8. In a grinding machine the combination of a bed or support, a toolcarriage carried thereby and movable relative thereto, means foractuating the tool carriage at a slow feeding rate, means for actuatingthe tool carriage at a rapid' rate including a reversible motor, andmeans connecting either the slow feeding rate means or the rapid ratemeans with the tool' carriage including 105 a shifter fork, a. shifterrod, a head on the rodi having a cam groove therein, a cross slidecooperating with the cam, and a lever for actuating the cross slide toeffect a shifting of the head and rod through the cam groove. 110

9. In a grinding machine of the class described the combination of abed, a tool carriage carried thereby, and movable relative thereto,means for actuating the tool carriage at a slow feeding rate, means foractuating the tool carriage at a rapid rate including a reversible motoa switch for the motor and a lever for the motor switch operable inopposite directions to effect a rotation of the motor in said oppositedirections and said lever indicating in which direction the toolcarriage will be operated.

l0. In a grinding machine the combination of a bed or support, a toolcarriage carried thereby and movable relative thereto, means foractuating the tool carriage at a slow feeding rate, means for actuatingthe tool carriage at a rapid rate including a reversible motor and a.switch for the motor, and means for connecting either the slow feedingrate means or the rapid rate means vith the tool y carriage and fordetermining the direction of rotation of the motor including a shifterfork, a shifter rod, a head on the rod having a cam groove therein,across slide cooperating with the cam and a lever operable through oneplane for actuating the cross slide to eect a shifting of the head androd through the cam groove and operablein opposite directions through anangularly related plane for closing the switch to effect a rotation ofthe motor in opposite directions and actuate the tool carriagecorrespondingly.

11. In a grinding machine the combination of a bed, a tool carriagecarried thereby and shiftable relative thereto, means for shifting thecarriage including a rotatable screw, a gear on the' screw,

a pinion in constant operative engagement with the gear, a second gearassociated with the pinion,

a. pair of pinions adapted to be independently meshed withthe gear fordriving the gear thereby, means for rotating one of the pinions at anormal feeding rate, and additional means for rotan-.150

ing the other pinion at a rapid traverse rate.

12. In a grinding machine the combination of a bed, a tool carriagecarried thereby and shiftable relative thereto, means for eiecting saidshifting including a rotatable screw, means driven at a slow feedingrate, means driven at a rapid traverse rate, transmission meansshiftable between the feeding rate means and rapid traverse rate meansfor correspondingly actuating the tool carriage, and interlocking meansbetween the feeding rate means and the rapid traverse rate means wherebythe energization of one of said means precludes the operation of theother. i

13. In a grinding machine the combination of a bed, a tool carriagecarried thereby and shiftable relative thereto, means for effecting saidshifting including a rotatable screw, means driven at a slow feedingrate, means driven at a rapid traverse rate, transmission meansshiftable between the feeding rate means and rapid traverse rate meansfor correspondingly actuating the tool carriage,

and interlocking means between the feeding rate means and the rapidtraverse rate means whereby the energization of one of said meansprecludes the operation of the other, said means including a singlelever operable in one plane for energizing one of said means and in anangularly related plane for engaging the remaining means.

14. In a grinding machine the combination of a bed, a grinding wheelcarriage carried thereby and shiftable relative thereto, means forshifting said carriage including a rotatable adjusting screw, means forrotating the screw at normal feeding rates, means for rotating saidscrewat rapid traverse rates, and control means therefor including a manuallyactuable lever operable in angularly related planes and in oppositedirections for engaging and energizing respectively the slow rateactuating means and the rapid traverse rate actuating means. i Y

BERNARD A. KEARNS.

